<template>
  <p>count值为：{{ count }}</p>
  <button @click="add">加n</button>
</template>

<script setup>
import { ref } from "vue";
const emit = defineEmits(["updateCount"]);
const count = ref(1);
const add = () => {
  count.value++;
  emit("updateCount", 1);
};
</script>
